/**
 * Created by minigci.he on 16/9/21.
 */
console.log('----------------------')
console.log('test12')

var m = new Map();
m.set('edition', 6)
m.set(262, 'standard')
m.set(undefined, 'nah')
console.log(m.has('edition'))   // true
console.log(m.has('years'))     // false
console.log(m.has(262))         // true
console.log(m.has(undefined))   // true